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Proceedings Paper

Analysis of mode transitions in a long-period fiber grating with a nano-overlay of diamond-like carbon
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Paper Abstract

This work presents optimization analysis of the sensitivity to variations of the external refractive index (RI) of long-period fiber grating (LPFG) coated with a nano-overlay of diamond-like carbon (DLC) material. Through numerical simulations, we have shown that both the dual-resonance and mode transition phenomena can be simultaneously exploited to substantially increase the sensitivity to variations of the external RI. The tuning of the DLC layer thickness to displace the dual-resonance band into a more suitable region of the spectrum is also reported. To perform this analysis, we implemented a novel pseudo-heuristic simulation model based on a 4-layer step-index fiber layer model and coupled mode theory. The dispersion dependence on the DLC overlay thickness was modeled from experimental data. LPFG parameters were fitted to an experimental transmission spectrum. The simulation model and the obtain results provides guidance for the fabrication of the device.

Paper Details

Date Published: 25 September 2014
PDF: 8 pages
Proc. SPIE 9288, Photonics North 2014, 928810 (25 September 2014); doi: 10.1117/12.2075392
Show Author Affiliations
D. Brabant, Univ. du Québec en Outaouais (Canada)
M. Koba, National Institute of Telecommunications (Poland)
Mateusz Smietana, Warsaw Univ. of Technology (Poland)
Wojtek J. Bock, Univ. du Québec en Outaouais (Canada)


Published in SPIE Proceedings Vol. 9288:
Photonics North 2014
Steve MacLean; David V. Plant, Editor(s)

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